Cartons



Feb. 4, 1964 F. L. SCHlLL CARTONS Filed July 2, 1962 United States Patent Ofiice 3,lZll,334 Patented Feb. 4, 1964 3,120,334 (JARTGNS Folke Lennart Schill, Norrkoping, Sweden, assignor to Esselte Forpachning Aktiebolag, Norrltoping, Sweden, a corporation of Sweden Filed July 2, 1962, Ser. No. 206,572 2 Claims. (Cl. 2291-38) This invention relates to a carton in the shape of quadrilateral box of cardboard or like material which at least at one end has a separate closure member hinged to one side of the carton, and interconnected closure members hinged to the remaining three sides of the carton, the opposed pair of said interconnected closure members having diagonal crease lines extending to the free corners of said closure members so that said members can be doubled and come to lie inwardly of the intermediate closure member whereupon the separate closure member permits being folded down onto said intermediate member. Such a design of the closure members has not made it possible hitherto to provide any tight sealing of the carton, and at least when the carton is used for packing finely divided material, it has therefore been necessary to provide a lining therein. The carton according to the present invention eliminates this drawback and is essentially characterised by the fact that the diagonal crease lines are relatively deep scores in that side of the opposed pair of interconnected closure members, which is to face the interior of the carton. Said scores guarantee that the members in which said scores are provided are doubled into surface contact with one another, which results in a tight sealing of the carton.

These and further features of the invention and the advantages thereof will become apparent from the following description, reference being made to the accompanying drawing, in which:

H6. 1 is a developed plan view of the carton blank;

FIGS. 2 and 3 show the interconnected closure members in their closed position both according to the invention and the previously known embodiment, respectively.

The substantially rectangular carton blank is divided by means of longitudinal and transverse crease lines (indicated by dash and dot lines) into several panels. There are four rectangular panels ]l4 of which panels 1, 3 are broad and panels 2, 4 are narrow. The panels 1-4 will form the four sides of the erected carton. At both ends the panels 1-4 have four end closure flaps 5-3, the end closure flaps 5, 7 being broad and the end closure flaps 6, 8 being narrow. Moreover, the blank has a glue flap 9 at one side edge, which flap is to be glued to panels 1 and 5 so that there is formed an open tube of rectangular cross section, which is open at the ends.

The end closure flaps 5-8 preferably are of a length equal, or approximately equal, to the width of the narrow panels 2 and 4 so that each of the broad end closure flaps 5, 7 correspond to the cross section of the erected carton. The end closure flaps 5 preferably are of such a length as to provide a seal against the crease lines between the panel 3 and the end closure flaps 7, in the erected carton.

The end closure flaps 7 are separated from the end closure flaps 68 by cuts 10 and hinged to the panel 3 through a crease line. The end closure flaps 5, however, are integral with the narrow end closure flaps 6 and 3, at least when the blank is in the shape of an open tube.

Each of the narrow end closure flaps 6 and 8 is provided with a diagonal crease line 11 which runs to the free corner of the flap. The end closure flaps 6 and 8 can thus be doubled and come to lie inwardly of the intermediate end closure flap 5. The end closure flap 7 hinged to the panel 3 is then swung down and attached to the end closure flap 5 by gluing, heat-sealing or like process suitable to perform in a filling machine.

According to the invention, the diagonal crease lines 11 in the end closure fiaps 6 and 8 consist of relatively deep scores provided in that side of the end closure flaps 6 and 8 which is to face to the interior of the carton. Said scores Ill preferably are of a depth approximately equal to half the cardboard thickness. By reason of the scores 11 the two sections 6, 6" and 8, 3", respectively, of the end closure flaps 5 and 8, respectively, will be in surface contact with one another, as will appear from FIG. 2. FIG. 3 shows the corresponding sections in the previously known embodiment.

By coating the outer side of the end closure flaps 6 and 8 with glue, wax, thermoplastic or like material the sections 6, 6" and 8, 8", respectively, can be fixed to one another in surface contact when the carton is closed. The edge of the end closure flaps 5 can also be coated with glue, wax, thermoplastic or like material to fix it to the corresponding crease lines between the panel 3 and the end closure flaps 7 when the carton is closed.

The above embodiment of the invention was described for purposes of illustration rather than limitation. All possible variations and modifications of the invention are understood as being included within the scope of the appended claims.

What I claim and desire to secure by Letters Patent is:

1. A blank for producing a quadrilateral container comprising a one-piece blank of rectangular outline, said blank including two pairs of alternately disposed, rectangular panels connected on mutually parallel fold lines, said blank including upper and lower fold lines defining the upper and lower margins of said side panels, a sealing flap extending from opposite ends of each of said side panels at said upper and lower fold lines and having end margins co-linear with said parallel fold lines, one of the said side panels at the end of said blank and the sealing flap extending therefrom having a glue flap connected thereto and extending the length of said blank, the sealing flaps at the ends of another of said side panels having free end margins, and one of each of the sealing flaps of the remaining side panels being foldably connected at adjacent ends, the sealing flaps flanking said sealing flap having free said end margins having diagonal cut-score lines on the inner surfaces thereof and originating from the upper and lower margins of said side panels and hisecting the same and extending toward said free edges, said sealing flaps having a height equal to the width of said side panels upon which said cut-scored sealing flaps are connected.

2. The blank of claim 1 in which said cut-score lines penetrate at least one-half the thickness of said blank for insuring sealing of said blank when said blank is formed into a sealed carton.

References Cited in the file of this patent UNITED STATES PATENTS 2,428,845 Guyer Oct. 14, 1957 

1. A BLANK FOR PRODUCING A QUADRILATERAL CONTAINER COMPRISING A ONE-PIECE BLANK OF RECTANGULAR OUTLINE, SAID BLANK INCLUDING TWO PAIRS OF ALTERNATELY DISPOSED, RECTANGULAR PANELS CONNECTED ON MUTUALLY PARALLEL FOLD LINES, SAID BLANK INCLUDING UPPER AND LOWER FOLD LINES DEFINING THE UPPER AND LOWER MARGINS OF SAID SIDE PANELS, A SEALING FLAP EXTENDING FROM OPPOSITE ENDS OF EACH OF SAID SIDE PANELS AT SAID UPPER AND LOWER FOLD LINES AND HAVING END MARGINS CO-LINEAR WITH SAID PARALLEL FOLD LINES, ONE OF THE SAID SIDE PANELS AT THE END OF SAID BLANK AND THE SEALING FLAP EXTENDING THEREFROM HAVING A GLUE FLAP CONNECTED THERETO AND EXTENDING THE LENGTH OF SAID BLANK, THE SEALING 